The opto-coupler in the meter supplied by Apator was mechanically and signally compatible with EN62056-21 and is designed for use with DLMS/HDLC protocol (EN62056-46, EN62056-53). Data transmission speed is 19200 bps, 8N1 character format.
A dedicated APATOR program is available for reading and parameterizing the meter, but any DLMS/HDLC client program configured to work in accordance with the listed serial port parameters can also read it. The client’s program should be able to handle APDU COSEM up to min.284 bytes for both data transmission and reception.
All outside (public) associations require authentications of the LLS link. In the reader, the DLMS protocol provides communication in the client-server architecture, where the server has a counter. The server is a logical device defined as a measuring device.